WO2021125466A1 - Structure de bande interdite électromagnétique - Google Patents

Structure de bande interdite électromagnétique Download PDF

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Publication number
WO2021125466A1
WO2021125466A1 PCT/KR2020/007484 KR2020007484W WO2021125466A1 WO 2021125466 A1 WO2021125466 A1 WO 2021125466A1 KR 2020007484 W KR2020007484 W KR 2020007484W WO 2021125466 A1 WO2021125466 A1 WO 2021125466A1
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Prior art keywords
electromagnetic bandgap
bandgap structure
slit
dipole
antenna
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PCT/KR2020/007484
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English (en)
Korean (ko)
Inventor
김승한
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국방기술품질원
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Priority to CN202080083865.2A priority Critical patent/CN114747084A/zh
Priority to JP2022529617A priority patent/JP7425868B2/ja
Priority to EP20903581.5A priority patent/EP4080676A4/fr
Priority to US17/785,396 priority patent/US20230010074A1/en
Publication of WO2021125466A1 publication Critical patent/WO2021125466A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/062—Two dimensional planar arrays using dipole aerials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/22—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation in accordance with variation of frequency of radiated wave
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0236—Electromagnetic band-gap structures
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09672—Superposed layout, i.e. in different planes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/0969—Apertured conductors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10098—Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/15—Position of the PCB during processing
    • H05K2203/1572—Processing both sides of a PCB by the same process; Providing a similar arrangement of components on both sides; Making interlayer connections from two sides

Definitions

  • This application relates to electromagnetic bandgap structures, directional antennas comprising same, and uses thereof.
  • Directional antennas are widely used in wireless sensor systems such as aircraft that utilize radio and microwave bands.
  • it is essential to apply a light-weight and small-sized directional antenna to avionics equipment such as a radar warning system and its supporting equipment.
  • widely used dipole antennas can be used by changing the omni-directional radiation type to the directional radiation type by using a reflector, but in this case, the distance between the radiator and the reflector must be spaced apart by 1/4 wavelength in order to secure the radioactivity, so it is miniaturized.
  • the electromagnetic bandgap (EBG) structure is implemented through a periodic metal pattern and has in-phase reflection characteristics in the bandgap frequency band. Due to these characteristics, there is an advantage in that good radioactivity can be secured even if the radiator is located close to the EBG ground plane.
  • the EBG structure can be generalized to a special LC network, and can be implemented by arranging this LC network in one dimension or two dimensions.
  • the shape of applying the two-dimensional EBG structure to the ground plane and applying the antenna thereon can greatly improve the directivity of the antenna, but it is difficult to implement.
  • the shape of applying the one-dimensional EBG structure to the ground plane and applying the antenna near it is easy to implement, but there is a limit to improving the directivity of the antenna.
  • the one-dimensional EBG structure also has another advantage of being able to implement a lightweight and small antenna. Therefore, there is a demand for a new type of one-dimensional EBG structure that improves these limitations.
  • An object of the present application is to provide an electromagnetic bandgap structure capable of exhibiting light weight and small size and excellent directivity, and a directional antenna including the same.
  • Such an electromagnetic bandgap structure and a directional antenna including the same may be used in avionics equipment and portable measurement equipment.
  • the bandgap structure of the present application includes a substrate; a lower layer formed under the substrate and including two or more first slits disposed on a first surface at regular intervals from each other; and an upper layer formed on the substrate and including two or more second slits disposed at regular intervals on the first surface, and having a resonance structure, wherein the width or spacing of at least one slit is the resonance of the dipole antenna.
  • the frequency depends on the wavelength.
  • an interval between the two or more first slits may be 0.002 or less of the resonance frequency wavelength.
  • the width of the first slit may be 0.015 to 0.020 of the resonance frequency wavelength.
  • the length of the first slit may be 0.05 to 0.10 of the resonance frequency wavelength.
  • the thickness of the first slit may be less than or equal to 0.0002 of the resonance frequency wavelength.
  • the lower layer may be formed of one or more metals selected from the group consisting of copper, gold, silver, and aluminum.
  • first slit and the second slit may be arranged at equal intervals so as not to overlap each other.
  • an interval between the two or more second slits may be 0.002 or less of the resonance frequency wavelength.
  • the width of the second slit may be 0.015 to 0.020 of the resonant frequency wavelength.
  • the second slit may have a length of 0.05 to 0.10 of the resonant frequency wavelength.
  • the thickness of the second slit may be less than or equal to 0.0002 of the resonant frequency wavelength.
  • the upper layer may be formed of one or more metals selected from the group consisting of copper, gold, silver, and aluminum.
  • the directional antenna of the present application includes the electromagnetic bandgap structure; a dipole antenna having a first dipole element spaced apart from the first surface of the lower layer of the electromagnetic bandgap structure and a second dipole element spaced apart from the first surface of the upper layer of the electromagnetic bandgap structure; and a power supply unit for applying an electrical signal to the first dipole element and the second dipole element of the dipole antenna.
  • each of the first dipole element and the second dipole element may be parallel to a first surface of the electromagnetic bandgap structure, and may be connected to the power supply unit by a first power line and a second power line, respectively.
  • each of the first dipole element and the second dipole element may be provided with an interval of 0.06 or less of a resonance frequency wavelength from the first surface of the electromagnetic bandgap structure.
  • the sum of the lengths of the first dipole element and the second dipole element in a state in which they are symmetrical with respect to the first power line and the second power line may be 0.35 to 0.6 of the resonance frequency wavelength.
  • the dipole antenna may have a resonant frequency bandwidth of 15% or more.
  • the dipole antenna may have a maximum implementation gain of 2 dBi or more.
  • the dipole antenna may have a radiation efficiency of 80% or more.
  • the dipole antenna may have a front-rear radiation ratio of 8 dB or more.
  • the avionics equipment of the present application includes the directional antenna.
  • the portable measuring device of the present application includes the directional antenna.
  • the electromagnetic bandgap structure of the present application and the directional antenna including the same may be excellent.
  • the electromagnetic bandgap structure and the directional antenna including the same may be used in avionics equipment and portable measurement equipment.
  • FIG. 1 is a view showing an electromagnetic bandgap structure according to an embodiment of the present application.
  • FIG. 2 is a diagram illustrating an LC circuit in an electromagnetic bandgap structure by way of example in order to explain an LC circuit formed by a first slit and a second slit of the electromagnetic bandgap structure.
  • FIG. 3 is a diagram illustrating an LC circuit formed by a first slit and a second slit of an electromagnetic bandgap structure.
  • FIG. 4 is a diagram illustrating a directional antenna according to an embodiment of the present application.
  • the electromagnetic bandgap structure of the present application includes a substrate 1100 , a lower layer 1200 formed under the substrate, and an upper layer 1300 formed above the substrate.
  • the lower layer 1200 includes two or more first slits 1201 disposed on the first surface 1210 at regular intervals from each other.
  • the upper layer 1300 includes two or more second slits 1301 disposed at regular intervals on the first surface 1310 .
  • the electromagnetic bandgap structure of the present application has the above-described structure, any one or more of the resonant frequency and bandwidth of the dipole antenna is excellent, and it exhibits light weight and small size, and can be applied to a dipole antenna to be described later and has excellent directivity.
  • the spacing may be a length measured with respect to the longitudinal direction of the electromagnetic bandgap structure, that is, the x-axis direction.
  • the first surface means a patterned side formed by a slit.
  • the first surface of the lower layer and the first surface of the upper layer are respectively formed on the lower layer and the upper layer and mean the same side side.
  • slit means an elongated hole.
  • a substrate made of a non-conductive material having a dielectric constant such as FR4 may be used as the substrate. By using the above-mentioned kind as the substrate, insulation can be exhibited.
  • the electromagnetic bandgap structure has a resonance structure by including the first slit and the second slit.
  • the "resonant structure” means a structure configured to transmit a signal wave, a pump wave, and a converted wave, and reflect the secondary harmonic wave to resonate by reciprocating or circulating inside, without being transmitted to the outside.
  • 2 is a diagram illustrating an LC circuit in an electromagnetic bandgap structure by way of example in order to explain an LC circuit formed by a first slit and a second slit of the electromagnetic bandgap structure.
  • FIG. 3 is a diagram illustrating an LC circuit formed by the first slit and the second slit of the electromagnetic bandgap structure. 2 and 3 , the electromagnetic bandgap structure may form an LC circuit by the first slit and the second slit, and may have a resonance structure by the LC circuit.
  • the width or spacing of the at least one slit is determined according to the resonant frequency wavelength of the dipole antenna.
  • the resonance frequency means a frequency at which a current or voltage is maximized by causing a resonance phenomenon when the natural frequency determined by L and C included in the circuit matches the frequency of the power source.
  • the resonance frequency is the resonance frequency f sc at the series resonance occurring in the series circuit of R, L, C and the resonance frequency f pc at the parallel resonance occurring in the parallel circuit of R, L, C is It can be calculated by the following general formulas 1 and 2, respectively.
  • L L means an inductance formed by each of the lower layer and the upper side made of the conductors of the first and second slits
  • C L is the capacitance formed between the first and second slits.
  • C e denotes a capacitance formed by a spacing between the first and second slits, respectively.
  • the resonant frequency f res may be determined as a smaller value among f sc and f pc determined in Formulas 1 and 2 above.
  • "resonant frequency wavelength” means a value obtained by dividing the resonant frequency by the speed of light. For example, when the resonant frequency is 2.5 GHz, the resonant frequency wavelength may be 120 mm. In this case, the interval g 1 between the two or more first slits may be 0.0017 or less.
  • the spacing g 1 between the two or more first slits may be 0.002 or less of the resonance frequency wavelength, and specifically, 0.001 or less.
  • the lower limit of the interval between the two or more first slits may be 0.0001 or more or 0.0005 or more of the resonance frequency wavelength.
  • the interval between the two or more first slits means the interval between adjacent first slits.
  • the first slit may have a resonant frequency and/or bandwidth in the range to be described later when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later by having an interval in the above-described range from the neighboring first slit. and, due to this, may exhibit light weight and small size, and excellent directivity.
  • the width w 1 of the first slit may be 0.015 to 0.020 of the resonance frequency wavelength, and specifically, 0.016 to 0.019 or 0.017 to 0.018.
  • the first slit has a width in the above-described range, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it may have a resonant frequency and/or bandwidth in the range to be described later, thereby reducing light weight and It represents a small size and may have excellent directivity.
  • the length l 1 of the first slit may be 0.05 to 0.10 of the resonance frequency wavelength, and specifically, 0.06 to 0.09 or 0.07 to 0.08.
  • the first slit has a length in the above-described range, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it may have a resonant frequency and/or bandwidth in the range to be described later, thereby reducing light weight and It represents a small size and may have excellent directivity.
  • the thickness t 1 of the first slit may be 0.0002 or less of the resonance frequency wavelength, and specifically, 0.0001 or less.
  • the lower limit of the thickness of the first slit may be 0.00001 or more or 0.00005 or more.
  • the first slit has a thickness in the above-described range, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it may have a resonant frequency and/or a bandwidth in the range to be described later, thereby reducing light weight and It represents a small size and may have excellent directivity.
  • the lower layer may be a conductor.
  • the lower layer may be formed of one or more metals selected from the group consisting of copper, gold, silver, and aluminum. By using the above-mentioned type of metal as the lower layer, electrons can be moved.
  • the lower layer may be formed by printing the above-described type of metal on the substrate.
  • the printing technique is not particularly limited, since any technique known in the art may be used.
  • the first slit and the second slit may be arranged at equal intervals so as not to overlap each other. Specifically, the first slit and the second slit may be disposed so as not to overlap each other in the height direction. The first slit and the second slit are arranged at equal intervals so as not to overlap each other, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it may have a resonant frequency and/or bandwidth in the range to be described later, Due to this, light weight and small size may be exhibited, and directivity may be excellent.
  • the interval g 2 between the two or more second slits may be 0.002 or less of the resonance frequency wavelength, and specifically, 0.001 or less.
  • the lower limit of the interval between the two or more second slits may be 0.0001 or more or 0.0005 or more of the resonance frequency wavelength.
  • the interval between the two or more second slits means the interval between the second slits adjacent to each other.
  • the second slit has an interval in the above-described range from the neighboring second slit, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it can have a resonant frequency and/or bandwidth in the range to be described later. and, due to this, may exhibit light weight and small size, and excellent directivity.
  • the width w 2 of the second slit may be 0.015 to 0.020 of the resonance frequency wavelength, and specifically, 0.016 to 0.019 or 0.017 to 0.018.
  • the second slit has a width in the above-described range, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it may have a resonant frequency and/or bandwidth in the range to be described later. It represents a small size and may have excellent directivity.
  • the length of the second slit (l 2 ) may be 0.05 to 0.10 of the resonance frequency wavelength, and specifically, 0.06 to 0.09 or 0.07 to 0.08.
  • the second slit has a length in the above-described range, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, it may have a resonant frequency and/or a bandwidth in the range to be described later, thereby reducing light weight and It represents a small size and may have excellent directivity.
  • the thickness t 2 of the second slit may be 0.0002 or less of the resonance frequency wavelength, and specifically, 0.0001 or less.
  • the lower limit of the thickness of the second slit may be 0.00001 or more or 0.00005 or more.
  • the second slit has a thickness in the above-described range, so that when the electromagnetic bandgap structure of the present application is applied to a dipole antenna to be described later, the second slit may have a resonance frequency and/or bandwidth in the range to be described later. It represents a small size and may have excellent directivity.
  • the upper layer may be a conductor.
  • the upper layer may be formed of one or more metals selected from the group consisting of copper, gold, silver, and aluminum. By using the above type of metal as the upper layer, electrons can be moved.
  • the upper layer may be formed by printing the above-described type of metal on a lower portion of the substrate.
  • the printing technique is not particularly limited, since any technique known in the art may be used.
  • the present application also relates to a directional antenna.
  • the directional antenna includes the electromagnetic bandgap structure described above, and the details of the electromagnetic bandgap structure to be described later are the same as those described in the electromagnetic bandgap structure, and thus will be omitted.
  • the directional antenna of the present application includes an electromagnetic bandgap structure 4100 , a dipole antenna 4200 , and a power supply unit 4300 .
  • the dipole antenna includes a first dipole element 4211 provided to be spaced apart from the first surface of the lower layer of the electromagnetic bandgap structure and a second dipole element 4220 provided to be spaced apart from the first surface of the upper layer of the electromagnetic bandgap structure.
  • the power supply unit may apply an electrical signal to the first dipole element and the second dipole element of the dipole antenna.
  • the directional antenna of the present application may have the above-described structure, thus exhibiting light weight and small size, and excellent directivity.
  • directionality refers to a phenomenon in which device characteristics exhibit strong properties in a specific direction in transmission and reception of sound, radio waves, light, etc., that is, a property to advance in a predetermined direction.
  • directional antenna directional/sectorized antenna
  • isotropic antenna means an antenna whose radiation intensity is constant in any direction.
  • dipole means that there are two poles corresponding to each other.
  • the "dipole antenna” is fed from the central part of the conducting wire having an effective antenna length of 1/2 wavelength, and the potential distribution and polarity of the upper and lower or left and right lines with respect to the center of the antenna are always symmetrical It means an antenna that works like a dipole.
  • Each of the first dipole element and the second dipole element is parallel to the first surface 4110 of the electromagnetic bandgap structure, and is connected to the power supply unit by a first power line 4212 and a second power line 4222, respectively.
  • the first power line and the second power line may be grounded to the first ground plane 1202 of the lower layer and the first ground plane 1302 of the upper layer, respectively.
  • each of the first power line and the second power line may be perpendicular to a first surface of the electromagnetic bandgap structure.
  • the dipole antenna having the first dipole element and the second dipole element is connected to the power supply unit to receive power.
  • the first surface of the electromagnetic bandgap structure may be any one side patterned by the first and second slits of the lower and upper layers included in the electromagnetic bandgap structure, respectively.
  • Each of the first dipole element and the second dipole element may be provided with an interval (g 4 ) of 0.06 or less of a resonance frequency wavelength from the first surface of the electromagnetic bandgap structure.
  • Each of the first dipole element and the second dipole element is provided with the first surface of the electromagnetic bandgap structure at the aforementioned interval, and thus may have a resonant frequency and/or bandwidth in the range to be described later, thereby reducing light weight and small size. and may have excellent directivity.
  • the first dipole element and the second dipole element may be symmetrical with respect to the first power line and the second power line.
  • first dipole element and the second dipole element as long as the first dipole element and the second dipole element are symmetrical with respect to the first power line and the second power line, the first dipole element and the second dipole element
  • the longitudinal direction of each of the two dipole elements is not particularly limited. This makes it possible to form a dipole antenna that acts like a dipole.
  • the sum (l 3 ) of the lengths of the first dipole element and the second dipole element in a state symmetrical with respect to the first power line and the second power line is 1/2 of the wavelength of the resonance frequency.
  • the sum (l 3 ) of the lengths of the first dipole element and the second dipole element in a symmetrical state with respect to the first power line and the second power line may be 0.35 to 0.6, specifically , it may be 0.4 to 0.55 or 0.45 to 0.5.
  • the sum of the lengths of the first dipole element and the second dipole element in a state in which they are symmetrical with respect to the first power line and the second power line is a state in which the first dipole element and the second dipole element are symmetrical. Since the first power line and the second power line are overlapped in , the length may be the sum of the lengths of the first dipole element and the second dipole element, excluding the widths of the first and second power lines.
  • the dipole antenna may have a resonant frequency bandwidth of 15% or more. Specifically, the resonant frequency bandwidth of the dipole antenna may be 16% or more, 17% or more, or 18% or more. The upper limit of the resonant frequency bandwidth of the dipole antenna may be 20% or less or 19% or less. Since the dipole antenna has a resonant frequency bandwidth in the above-described range, it can be used for communication and sensors using various or wide frequencies.
  • the resonant frequency bandwidth may mean a frequency range in which a resonance phenomenon occurs.
  • the resonant frequency bandwidth of the dipole antenna may be calculated through the following general formula (3).
  • f res is the resonance frequency
  • ⁇ f is the bandwidth
  • C eff is the capacitance affecting the resonance
  • L L is the inductance described above.
  • the maximum realized gain of the dipole antenna may be 2 dBi or more, specifically, 3 dBi or more or 4 dBi or more.
  • the upper limit of the maximum realization gain of the dipole antenna is not particularly limited, but may be, for example, 7 dBi or less, 6 dBi or less, or 5 dBi or less. Since the dipole antenna has the maximum realization gain in the above-described range, the directivity of the antenna may be excellent.
  • the maximum implementation gain may refer to an index for determining the directivity of an antenna.
  • the radiation efficiency of the dipole antenna may be 80% or more. Specifically, the radiation efficiency of the dipole antenna may be 81% or more, 82% or more, 83% or more, or 84% or more. In addition, the higher the upper limit of the radiation efficiency of the dipole antenna, the more advantageous it may be, for example, 100% or less, 95% or less, 90% or less, or 85% or less.
  • the electromagnetic bandgap structure may include a dipole antenna having a radiation efficiency in the above-described range, thereby exhibiting light weight and small size, and excellent directivity. The radiation efficiency may mean a ratio of power of radio waves radiated from the antenna to power supplied to the antenna.
  • the front-rear radiation ratio of the dipole antenna may be 8 dB or more.
  • the front-rear radiation ratio of the dipole antenna may be 8.5 dB or more, 9 dB or more, 9.5 dB or more, 10 dB or more, or 10.5 dB or more.
  • the upper limit of the front-rear radiation ratio of the dipole antenna is advantageous as it is larger, and may be, for example, 13 dB or less, 12.5 dB or less, 12 dB or less, 11.5 dB or less, or 11 dB or less.
  • the dipole antenna satisfies the above-mentioned front and rear radiation ratio, it is possible to maximize the efficiency of the antenna by concentrating radiation energy in one direction in the directional antenna, and to suppress radiation in an unwanted direction.
  • the front-rear radiation ratio may mean a difference between a radiation gain in a desired direction and a radiation gain in the opposite direction.
  • the present application also relates to the use of said directional antenna.
  • An exemplary directional antenna exhibits light weight and small size, and may have excellent directivity.
  • the directional antenna may be applied to avionics equipment.
  • a radar warning system or a foe identification device may be exemplified as such a avionics device, and the structure is not particularly limited as long as the directional antenna is included in the radar warning system or the foe identification device.
  • the directional antenna may be applied to portable measurement equipment.
  • portable measurement equipment ground support equipment for verification of a radar warning system, peer identification device, U/VHF communication device, etc. may be exemplified, and verification of the radar warning system, peer identification device, U/VHF communication device, etc.
  • the directional antenna is included in the ground support equipment for , the structure is not particularly limited.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

La présente invention concerne une structure de bande interdite électromagnétique, une antenne directionnelle la comprenant, et leur utilisation. La structure de bande interdite électromagnétique et l'antenne directionnelle la comprenant, de la présente invention, sont légères et de petite taille, et peuvent avoir une excellente directivité. De plus, la structure de bande interdite électromagnétique et l'antenne directionnelle le comprenant peuvent être utilisées pour un équipement électronique d'aviation et un équipement de mesure portable.
PCT/KR2020/007484 2019-12-17 2020-06-10 Structure de bande interdite électromagnétique WO2021125466A1 (fr)

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Application Number Priority Date Filing Date Title
CN202080083865.2A CN114747084A (zh) 2019-12-17 2020-06-10 电磁带隙结构
JP2022529617A JP7425868B2 (ja) 2019-12-17 2020-06-10 電磁バンドギャップ構造物
EP20903581.5A EP4080676A4 (fr) 2019-12-17 2020-06-10 Structure de bande interdite électromagnétique
US17/785,396 US20230010074A1 (en) 2019-12-17 2020-06-10 Electromagnetic band-gap structure

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KR1020190168698A KR102273378B1 (ko) 2019-12-17 2019-12-17 전자기 밴드갭 구조물
KR10-2019-0168698 2019-12-17

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EP (1) EP4080676A4 (fr)
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KR (1) KR102273378B1 (fr)
CN (1) CN114747084A (fr)
WO (1) WO2021125466A1 (fr)

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US20230010074A1 (en) 2023-01-12
CN114747084A (zh) 2022-07-12
EP4080676A4 (fr) 2024-01-03
KR20210077260A (ko) 2021-06-25
EP4080676A1 (fr) 2022-10-26
JP2023503294A (ja) 2023-01-27
JP7425868B2 (ja) 2024-01-31
KR102273378B1 (ko) 2021-07-06

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